Crushing and High Angle Conveying in Yugoslavian Copper Mine, Nov. 1721, 1986, Santiago, Chile. [9] Dos Santos,, bulk solids handling, "Sandwich Belt High Angle ConveyorsBroad Horizons", Vol. 7 (No. 2), pp. 229239 (1987). [10] Dos Santos,, Coal Prep 87, "High Angle ConveyorHAC Provides Shortest Route to